6.6 Electromagnetic Waves
January 29, 2015
Think about:
•How well behaved you are
•How good you are at science
•How much y...
Aims
• Describe visible light as part of the
electromagnetic spectrum
• State other types of radiation
Electromagnetic waves
Travel through empty space
Travel at 300 000 km/s
Transverse waves
They transfer energy
Light vs Sound
Example of wave
LIGHT SOUND
Type of wave
Speed in air /
km/s
Material of
medium
Light vs Sound
Example of wave
LIGHT SOUND
Type of wave Transverse Longitudinal
Speed in air /
km/s
300 000 340
Material o...
Example of wave
LIGHT SOUND
Type of wave
Speed in air /
km/s
Material of
medium
Example of wave
LIGHT SOUND
Type of wave
S...
Electromagnetic radiation
actually comes in packets
or lumps. I call these
packets ‘quanta’. A quanta
of light is called a...
The higher the frequency, the more
energy the photon has
Intensity
Energy of each photon
Number of photons arriving each second
The electromagnetic spectrum
Radio waves
Radiowaves
• Communications: TV, mobile phones, local
radio, police
Microwaves
Microwaves
• Microwaves ovens, communicating with
satellites, RADAR
Infrared
Infra-red
• Search and rescue teams, detect circulation
problems, (cancer, arthritis), astronomy,
burglar alarms
Light
Ultraviolet
UV
• Produce vitamin D in our skin, suntan, skin
cancer
X-rays
X-rays
• X-rays (bones, teeth), check welds and joints,
food
Gamma rays
Gamma rays
• Make Hulks, sterilise food and utensils,
tracers, radiotherapy
RECALL THE DETRIMENTAL EFFECTS OF
EXCESSIVE EXPOSURE OF THE HUMAN
BODY TO ELECTROMAGNETIC WAVES
3.13
Make an EM spectrum booklet
Guest starring Mr. Simon Porter
The EM spectrum
• You now have seven sections to fill in with
information regarding the seven types of
electromagnetic rad...
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
2.7 understanding the em sprecturm
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2.7 understanding the em sprecturm

  1. 1. 6.6 Electromagnetic Waves January 29, 2015 Think about: •How well behaved you are •How good you are at science •How much you like chocolate hob nobs
  2. 2. Aims • Describe visible light as part of the electromagnetic spectrum • State other types of radiation
  3. 3. Electromagnetic waves
  4. 4. Travel through empty space
  5. 5. Travel at 300 000 km/s
  6. 6. Transverse waves
  7. 7. They transfer energy
  8. 8. Light vs Sound Example of wave LIGHT SOUND Type of wave Speed in air / km/s Material of medium
  9. 9. Light vs Sound Example of wave LIGHT SOUND Type of wave Transverse Longitudinal Speed in air / km/s 300 000 340 Material of medium No material required Solid, liquid, gas
  10. 10. Example of wave LIGHT SOUND Type of wave Speed in air / km/s Material of medium Example of wave LIGHT SOUND Type of wave Speed in air / km/s Material of medium
  11. 11. Electromagnetic radiation actually comes in packets or lumps. I call these packets ‘quanta’. A quanta of light is called a photon. Nobel prize please…
  12. 12. The higher the frequency, the more energy the photon has
  13. 13. Intensity Energy of each photon Number of photons arriving each second
  14. 14. The electromagnetic spectrum
  15. 15. Radio waves
  16. 16. Radiowaves • Communications: TV, mobile phones, local radio, police
  17. 17. Microwaves
  18. 18. Microwaves • Microwaves ovens, communicating with satellites, RADAR
  19. 19. Infrared
  20. 20. Infra-red • Search and rescue teams, detect circulation problems, (cancer, arthritis), astronomy, burglar alarms
  21. 21. Light
  22. 22. Ultraviolet
  23. 23. UV • Produce vitamin D in our skin, suntan, skin cancer
  24. 24. X-rays
  25. 25. X-rays • X-rays (bones, teeth), check welds and joints, food
  26. 26. Gamma rays
  27. 27. Gamma rays • Make Hulks, sterilise food and utensils, tracers, radiotherapy
  28. 28. RECALL THE DETRIMENTAL EFFECTS OF EXCESSIVE EXPOSURE OF THE HUMAN BODY TO ELECTROMAGNETIC WAVES 3.13
  29. 29. Make an EM spectrum booklet Guest starring Mr. Simon Porter
  30. 30. The EM spectrum • You now have seven sections to fill in with information regarding the seven types of electromagnetic radiation • Include uses, dangers, detectors, examples and origins if you can • The better you make it the better it will help your revision

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